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truongsting2001
2 năm trước
cho tam giác ABC cân tại A(∠A<90 độ), CD là tia phân giác của ∠ACB(D ∈ AB).từ D kẻ DE⊥AC tại E, DF⊥BC tại F. Đường thẳng DE cắt BC tai K, đg thẳng DF cắt AC tại H a)cmr:ΔECK=ΔFCD b)cmr:ΔECK=ΔFCD c)gọi M là trung điểm HK. cmr: C,D,M thẳng hàng d)đường thẳng qua A vuông góc HD, cắt CM tại I.cmr:ΔIKD cân
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